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Physica C Superconductivity

Double-barrier Josephson structures as the novel elements for superconducting large-scale integrated circuits

M. Yu. Kupriyanov, Alexander Brinkman, Alexander A. Golubov, M. Siegel, Horst Rogalla

Published Nov 1, 1999• 80 citations
Publisher
DOI
10.1016/s0921-4534(99)00408-6

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Double-barrier Josephson junctions, with outer electrodes of superconducting Nb and a central thin layer of non-superconducting Al, are being developed as self-shunted junctions for high-frequency superconducting integrated circuits. This paper presents a simplified phenomenological model of the behaviour of such junctions (often called SINIS, for superconductor-insulator-normal-insulator-superconductor) based on the resistively shunted junction model, using Josephson coupling between the layers and the time-dependent Ginzburg-Landau equation to describe the dynamics of the weak induced energy gap in the Al layer. This analysis shows how non-hysteretic I - V characteristics can be obtained but suggests some limitations in their high-frequency performance. Predictions for critical current generally agree with prior experiments. The technological implications of this model are discussed.